Beta Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>EXERCISE-3>Q 32

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Calculate $E . N$ . of chlorine atom on Pauling scale if $I . E$ . of ${Cl}^{-}$ is $4 eV$ & $E . A$ . of ${Cl}^{+}$ is $+ 13.0 eV$ .

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Important Questions on Classification of Elements and Periodicity in Properties

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Beta Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>EXERCISE-3>Q 33

Upto argon find the number of elements which have lower

{IE}_{1}

as compared to

He

?

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Beta Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>EXERCISE-4>Q 2

The order of screening effect of electrons of

s, p

,

d,

and

f

orbitals of a given shell of an atom on its outer shell electrons is:

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Beta Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>EXERCISE-4>Q 3

The statement that is not correct for periodic classification of elements is:

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Beta Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>EXERCISE-4>Q 4

Among halogens, the correct order of amount energy released in electron gain (electron gain enthalpy) is

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Beta Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>EXERCISE-4>Q 6

Which of the following is the correct order of size of the given species :

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Beta Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>EXERCISE-4>Q 7

The formation of the oxide ion,

O^{2 -} (g),

from oxygen atom requires first an exothermic and then an endothermic step as shown below:

O (g) + e^{-} \to O^{-} (g); ∆ H^{⊖} = - 141 kJ {mol}^{- 1}

O^{-} (g) + e^{-} \to O^{2 -} (g); ∆ H^{⊖} = + 780 kJ {mol}^{- 1}

Thus process of formation of

O^{2 -}

in gas phase is unfavourable even though

O^{2 -}

is isoelectronic with neon. It is due to the fact that,

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Beta Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>EXERCISE-4>Q 10

Which of the following sequences contain atomic numbers of only representative elements?

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Beta Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>EXERCISE-4>Q 12

which of the following statements are correct ?